Zobrazeno 1 - 10
of 585
pro vyhledávání: '"Bordag, M"'
Publikováno v:
Phys. Rev. D v.109, 125014 (2024)
In this paper, we consider the convergence properties of the polarization tensor of graphene obtained in the framework of thermal quantum field theory in three-dimensional space-time. During the last years, this problem attracted much attention in co
Externí odkaz:
http://arxiv.org/abs/2405.14306
Autor:
Bordag, M.
The chromomagnetic vacuum of SU(2) gluodynamics is considered in the background of a finite radius flux tube (center-vortex) with homogeneous field inside and zero field outside. In this background there are tachyonic modes. These modes cause an inst
Externí odkaz:
http://arxiv.org/abs/2311.13553
Autor:
Bordag, M., Pirozhenko, I. G.
We consider the Casimir effect for a scalar field interacting with another scalar field that is confined to two half spaces. This model is aimed to mimic the interaction of the photon field with matter in two slabs. We use Dirichlet boundary conditio
Externí odkaz:
https://ul.qucosa.de/id/qucosa%3A84598
https://ul.qucosa.de/api/qucosa%3A84598/attachment/ATT-0/
https://ul.qucosa.de/api/qucosa%3A84598/attachment/ATT-0/
Autor:
Bordag, M.
Publikováno v:
Eur. Phys. J. A (2023) 59:55
I consider the chromomagnetic vacuum in SU(2). The effective Lagrangian in one loop approximation is known to have a minimum below zero which results in a spontaneously generated magnetic field. However, this minimum is not stable; the effective acti
Externí odkaz:
http://arxiv.org/abs/2207.08711
Autor:
Bordag, M., Skalozub, V.
In SU(N) gluodynamics, above the de-confinement temperature, the effective potential has minima at non-zero $A_0$-background fields in the two-loop approximation. Also, it has a minimum at non-zero chromomagnetic background field, known as 'Savvidy'-
Externí odkaz:
http://arxiv.org/abs/2112.01043
Publikováno v:
Phys. Rev. B, 104, 195431 (2021)
Exploiting methods of Quantum Field Theory we compute the bulk polarization tensor and bulk dielectric functions for Dirac materials in the presence of a mass gap, chemical potential, and finite temperature. Using these results (and neglecting eventu
Externí odkaz:
http://arxiv.org/abs/2107.10369
Autor:
Bordag, M.
We calculate the vacuum (Casimir) energy for a scalar field with $\phi^4$ self-interaction in (1+1) dimensions non perturbatively, i.e., in all orders of the self-interaction. We consider massive and massless fields in a finite box with Dirichlet bou
Externí odkaz:
http://arxiv.org/abs/2102.06425
Autor:
Bordag, M., Pirozhenko, I. G.
Publikováno v:
Vestnik of Immanuel Kant Baltic Federal University. Series: Physical-mathematical and technical sciences, 1, pp 51-72, 2021
We reconsider the composite string model introduced {30 years ago} to study the vacuum energy. The model consists of a scalar field, describing the transversal vibrations of a string consisting of piecewise constant sections with different tensions a
Externí odkaz:
http://arxiv.org/abs/2012.14301
Autor:
Bordag, M., Skalozub, V.
In the present paper, we return to the problem on a spontaneous generation of the $A_0$-background field in QCD at finite temperature and include in addition a quark chemical potential, $\mu$. We reproduce the known expressions in terms of Bernoulli'
Externí odkaz:
http://arxiv.org/abs/2009.11734
The basic thermodynamic quantities for a non-interacting scalar field in a periodic potential composed of either a one-dimensional chain of Dirac $\delta$-$\delta^\prime$ functions or a specific potential with extended compact support are calculated.
Externí odkaz:
http://arxiv.org/abs/1911.05875